Problems logging in

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I have to login twice, I get an error every first time

Your bookmark is pointing to a wrong address. When you create a bookmark, please check that the address is http://isamail.jyu.fi - if the address if https://login.jyu.fi/idp/Authn/UserPassword, you will need to modify the bookmark by right clicking and selection properties (or similar). Modify it to point directly to http://isamail.jyu.fi